JP2002198662A - Cover fixing structure to case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cover fixing structure to a case which can fix a cover to a case easily and surely without generating looseness. SOLUTION: An abutting part 37 having an obliquely inclined form is disposed below a protrusion 35 of a case 30 side surface. A cover 60 is put on an upper surface of the case 30. A bent segment 63 formed on the outer periphery of the cover 60 is bent to a side surface of the case 30. A hook 65 formed in the bent segment 63 is engaged with the lower side of the protrusion 35 formed on the case 30 side surface. Further, the hook 65 is bent toward the case 30 side, thereby making an upper edge 65a of the hook 65 abut against the abutting surface 37.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for attaching a cover to a case suitable for attaching a cover to a case of an electronic component or the like.

[0002]

2. Description of the Related Art Conventionally, there has been used an electronic component having a structure in which a sliding type object having a slider is accommodated in a case accommodating a substrate on which a sliding contact pattern is formed, and a sliding member is covered with a cover. . By operating the lever of the sliding type object protruding out of the case, the sliding type object in the case is moved, whereby the slider is brought into sliding contact with the sliding contact pattern to change its output.

FIG. 8 is a view showing a main part of an attachment structure for attaching a cover to the case, wherein FIG. 8A shows a state before attachment, and FIG. 8B shows a state after attachment. . As shown in the figure, the cover 90 is attached to the case 80 by placing a cover 90 made of a metal plate on the upper surface of the case 80 made of a molded resin, and attaching a bent piece 91 projecting from the outer periphery of the cover 90 to the side of the case 80. 81, the hook 93 provided at the lower portion of the bent piece 91 is engaged with the lower side of the projection 83 provided on the side surface 81 of the case 80 as shown in FIG. I was going.

However, the above-mentioned conventional mounting structure is
Since the hook 93 is engaged with the lower side of the projection 83 by bending the bent piece 91, the upper side 93 a of the hook 93 needs to exceed the tip of the projection 83. 93 upper side 93a
There is a problem that a gap B is formed between the lower surface of the projection 83 and the lower surface of the projection 83, and the mounting is loose. On the other hand, in order to prevent the play, the upper side 9 of the hook 93 is required.
It is necessary to design so that 3a just touches the lower surface of the projection 83, but then, when the hook 93 passes through the tip of the projection 83, the upper side 93a of the hook 93 hits the tip of the projection 83 and cuts it off. This causes a problem that an electrical failure occurs.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide a cover mounting structure for a case in which a cover can be easily and securely mounted on the case without play. It is in.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a case in which a cover is placed on the upper surface of a case, and a bent piece provided on the outer periphery of the cover is bent to the side of the case to provide a hook provided on the bent piece. In the cover attaching structure to the case, in which the cover is attached to the case by engaging with the lower side of the protrusion provided on the case side surface, the protrusion is inclined obliquely with respect to the case side surface below the case side surface protrusion. When the hook engaged with the lower side is further bent toward the case side, an abutting surface having a shape in which the upper side of the hook abuts is provided.

The present invention also provides a cover mounting structure for mounting a cover on a case by placing the cover on the upper surface of a case and fixing the opposing sides of the cover to the case. At least one of them is provided with a hook, and the hook is bent to the side of the case and fixed by engaging with a lower side of a projection provided on the case.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an exploded perspective view of a slide type variable resistor 1 to which the present invention is applied. As shown in FIG. 1, the sliding type variable resistor 1 includes a case 30 having a substrate 10 built therein and a sliding type object 4 having a slider 50 attached thereto.
0 and a cover 60 shaped to cover the case 30. Hereinafter, each component will be described.

FIG. 2 is a schematic sectional view of the case 30. As shown in FIG. In the figure, a substrate 10 is a flexible substrate,
A metal resin case 30 is formed around the reinforcing plate 20 with a metal plate attached to the lower surface thereof. A plurality of conductive patterns 11 extending linearly in the longitudinal direction are provided on the substrate 10 as shown in FIG.
A metal terminal plate 13 is connected to one end thereof. The metal terminal plate 13 protrudes from the case 30 to the outside.

[0010] On one side wall in the longitudinal direction of the case 30,
A long groove 31 protruding a lever 43 of a sliding die 40 described below.
Is provided. Further, on the left and right sides of the lower surface of the side wall of the case 30 from which the metal terminal plate 13 protrudes, a concave engaging portion 3 for engaging two claws 61 of a cover 60 described below.
3, 33 (only the front side is shown in FIG. 1).

On the other hand, on the side wall of the case 30 opposite to the side on which the engaging portion 33 is provided, projections 35, 35 are provided on upper portions on both right and left sides, respectively. Here, FIG.
It is the principal part expansion perspective view which looked at 5 from the lower side. As shown in the drawing, a tapered contact surface 37 and a tapered hook flank 39 are formed below the protrusion 35. The hook flank 39 is formed by chamfering the vertical side of the corner of the side wall of the case 30. On the other hand, the contact surface 37 is connected to the projection 35 so as to connect between the lower surface of the projection 35 and the hook flank 39.
Are formed so as to be inclined also with respect to the lower surface of the hook, and at the same time, with respect to the hook flank 39.

Returning to FIG. 1, the sliding type object 40 is
The main body 41 has a shape that is slidably housed inside the housing 41.
And a lever 43 protruding from one side surface of the main body 41 are integrally formed. A slider 50 made of a metal plate provided with a contact portion 51 that slides on the conductive pattern 11 of the substrate 10 is attached to the lower surface of the main body portion 41.

The cover 60 is formed by forming a metal plate into a substantially rectangular shape.
Claws 6 from near both ends of one of the opposite shorter sides.
1 and 61 are protruded and bent downward, and 1
A plurality of bent pieces 63 are protruded and bent downward. Hooks 65, 65 projecting in the width direction are provided on both sides of the bent piece 63. A gap 67 is formed between the hook 65 and the upper surface of the cover 60.

In order to assemble the slide type variable resistor 1, the main body 41 of the slide type object 40 is placed in the case 30.
Is accommodated, and a cover 60 is put thereon to obtain the state shown in FIG. Then, the tips of the claws 61 are bent and inserted into the engaging portions 33 on the back surface of the case 30. Further, a hook 65 provided on the opposite bent piece 63 is inserted below the protrusion 35 as shown in FIG.
Is inserted so as to cover it from above, so that a small gap C is provided between the lower surface of the projection 35 and the upper side 65a of the hook 65.
In this state, backlash occurs between the case 30 and the cover 60.

Therefore, in the present invention, as shown in FIG. 6, the hook 65 is further moved to the case 30 side (the hook clearance surface 3).
9), and the upper side 65a of the hook 65 contacts the contact surface 37. As a result, the cover 60 is securely fixed to the case 30, and there is no play between them. FIG.
FIG. 2 is a perspective view showing the slide variable resistor 1 assembled as described above.

In the present embodiment, one of the claws 61 and the other is the hook 65 as means for attaching the cover 60 to the case 30 is as follows. That is, if both sides are fixed with the claws 61, no play occurs between the cover 60 and the case 30. However, in this embodiment, in order to make the case 30 smaller and thinner, the case 3
The thickness of each part of the mold resin constituting the “0” is made thin. Nevertheless, as shown in FIG. 2, the portion where the metal terminal plate 13 protrudes from the case 30 has a thicker mold resin for fixing the metal terminal plate 13. There is room to provide the part 33 (see FIG. 1), and the claw 61 can be used. However, on the opposite side, there is no space for providing a concave portion because the reinforcing plate 20 is disposed on the lower surface thereof. Therefore, an engagement mechanism of the projection 35 and the hook 65 is used instead of the claw 61. In other words, since the engagement mechanism of the projection 35 and the hook 65 is used for the attachment mechanism of the case 30 and the cover 60, even if the thickness of each part of the case 30 is reduced, its strength is weakened, or a concave portion for engaging the claw is provided. Even if it is lost, the cover 60 can be easily attached to the case 30. Therefore, depending on the case, both the cover 60 and the attachment means on both sides of the case 30 may be attached by the projection 35 and the hook 65.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims and the technical idea described in the specification and the drawings. Is possible. Note that any shape, structure, or material not directly described in the specification and drawings is within the scope of the technical idea of the present invention as long as the effects and effects of the present invention are exhibited. For example, in the above-described embodiment, an example in which the present invention is applied to a slide type variable resistor is shown. In short, the cover is put on the upper surface of the case, the bent piece provided on the outer periphery of the cover is bent to the side of the case, and the hook provided on the bent piece is engaged with the lower side of the protrusion provided on the side of the case, thereby closing the cover. The present invention can be applied to any part as long as the cover is attached to the case.

[0018]

As described above in detail, according to the present invention, the hook engaged with the lower side of the projection on the side of the case is further bent toward the case, so that the upper side of the hook is brought into contact with the contact surface of the case. Because of the contact, the cover can be easily and securely attached to the case without play.

Further, according to the present invention, in the structure for attaching the cover to the case, the engagement mechanism of the hook and the projection is used, so that even if the thickness of each part of the case is reduced for miniaturization, it can be easily attached to the case. A cover can be attached.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a sliding variable resistor 1 to which the present invention is applied.

FIG. 2 is a schematic sectional view of a case 30.

FIG. 3 is an enlarged perspective view of a main part of the projection 35 as viewed from below.

FIG. 4 is an explanatory diagram of a method of assembling the slide variable resistor 1.

FIG. 5 is an explanatory diagram of a method of assembling the slide variable resistor 1.

FIG. 6 is an explanatory diagram of a method of assembling the slide variable resistor 1.

FIG. 7 is a perspective view showing the assembled slide variable resistor 1.

FIG. 8 is a diagram showing a main part of an attachment structure for attaching a cover 90 to a case 80.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sliding variable resistor 10 Substrate 11 Conductive pattern 13 Metal terminal plate 20 Reinforcement plate 30 Case 31 Long groove 33 Engagement part 35 Projection 37 Contact surface 39 Hook relief surface 40 Sliding object 41 Main body 43 Lever 50 Slider 51 contact portion 60 cover 61 claw 63 bent piece 65 hook 65a upper side

Claims (2)

[Claims] 1. A cover is placed on an upper surface of a case, a bent piece provided on an outer periphery of the cover is bent on a side surface of the case, and a hook provided on the bent piece is engaged with a lower side of a projection provided on a side surface of the case. In a cover attaching structure for attaching a cover to a case, a hook which is inclined obliquely with respect to the case side surface and engages with a lower side of the protrusion is bent further toward the case side under the protrusion on the case side surface. A cover mounting structure for a case, wherein a contact surface having a shape in which an upper side of a hook comes into contact when the hook is provided. 2. A cover mounting structure for mounting a cover on a case by mounting a cover on an upper surface of a case and fixing opposite sides of the cover to the case, wherein at least one of the opposite sides of the cover is provided. A cover mounting structure for a case, wherein a hook is provided on one side, and the hook is bent to a side surface of the case and fixed by being engaged with a lower side of a protrusion provided on the case.